i'm not sure what I'm doing wrong please help

Estela Company produces skateboards and scooters. Their per unit selling prices and variable costs follow Check My Work View Siateboards require 2 machine hours per unit. Scooters require 3 machine hours per unit (1) Your answer is complete but not entirely correct. Required (a) Compute the contribution margin per unit (b) Compute the contribution margin per machine hour. (Use cells A2 to 17 from the given information to complete this question.) Legend Correct Answer Incorrect Answer Students: The scratchpad area is for you to do any additional work you need to solve this question or can be us. Nothine in this area will be eraded. but it will be submitted with vour assienment